{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-33897", "tracking": { "current_release_date": "2026-04-01T00:46:37.378970Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33897", "initial_release_date": "2026-03-26T23:24:54.067578Z", "revision_history": [ { "date": "2026-03-26T23:24:54.067578Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-26T23:24:55.624612Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-26T23:38:47.139394Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-26T23:38:53.089858Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-27T06:43:23.870256Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (1)." }, { "date": "2026-03-27T19:41:45.935144Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-27T19:41:59.002463Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-27T19:47:34.052554Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (2).| References created (3).| CWES updated (1)." }, { "date": "2026-03-27T19:47:48.583505Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-27T20:56:12.334333Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-27T21:27:16.516752Z", "number": "11", "summary": "Unknown change." }, { "date": "2026-03-28T07:41:31.067000Z", "number": "12", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-30T19:25:10.377047Z", "number": "13", "summary": "Products connected (1).| Product Identifiers created (1)." }, { "date": "2026-03-30T19:25:16.329319Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-04-01T00:43:19.353645Z", "number": "15", "summary": "Products created (1).| Product Identifiers created (1).| Products removed (1)." } ], "status": "interim", "version": "15" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<6.23.0", "product": { "name": "vers:unknown/<6.23.0", "product_id": "CSAFPID-5965579", "product_identification_helper": { "cpe": "cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "incus" } ], "category": "vendor", "name": "linuxcontainers" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<6.23.0", "product": { "name": "vers:unknown/<6.23.0", "product_id": "CSAFPID-5919453" } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<6.23.0", "product": { "name": "vers:unknown/>=0|<6.23.0", "product_id": "CSAFPID-5944290" } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<=0.7.0", "product": { "name": "vers:unknown/>=0|<=0.7.0", "product_id": "CSAFPID-5944295" } } ], "category": "product_name", "name": "incus" } ], "category": "vendor", "name": "lxc" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/5.0.2-5+deb12u4", "product": { "name": "vers:deb/5.0.2-5+deb12u4", "product_id": "CSAFPID-5969890", "product_identification_helper": { "purl": "pkg:deb/debian/lxd@5.0.2-5+deb12u4?distro=bookworm" } } } ], "category": "product_name", "name": "lxd" } ], "category": "product_family", "name": "bookworm" } ], "category": "vendor", "name": "Debian" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33897", "cwe": { "id": "CWE-1336", "name": "Improper Neutralization of Special Elements Used in a Template Engine" }, "notes": [ { "category": "description", "text": "Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance's filesystem. This was allowed such that a template could theoretically read a file and then generate a new version of said file. Unfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges. Version 6.23.0 patches the issue.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33897" }, { "category": "description", "text": "Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance's filesystem. This was allowed such that a template could theoretically read a file and then generate a new version of said file. Unfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges. Version 6.23.0 patches the issue.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33897.json" }, { "category": "description", "text": "Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance's filesystem. This was allowed such that a template could theoretically read a file and then generate a new version of said file. Unfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges. Version 6.23.0 patches the issue.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-33897" }, { "category": "description", "text": "A flaw was found in Incus, a system container and virtual machine manager. An attacker with control over instance template files can exploit a vulnerability in the pongo2 templating engine. This flaw allows for arbitrary read or write operations as the root user on the host server by bypassing the intended chroot isolation mechanism. This can lead to unauthorized access and modification of critical system files.\nThis Important flaw in Incus, a system container and virtual machine manager, allows an attacker with control over instance template files to bypass chroot isolation. This enables arbitrary file read or write operations as the root user on the host server. This vulnerability affects Incus, which is available as a community project.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33897.json" }, { "category": "description", "text": "### Summary\nInstance template files can be used to cause arbitrary read or writes as root on the host server.\n\n### Details\nIncus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance's filesystem.\n\nThis was allowed such that a template could theoretically read a file and then generate a new version of said file.\n\nUnfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges.\n\n### Credit\nThis issue was discovered and reported by the team at [7asecurity](https://7asecurity.com/)", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-83xr-5xxr-mh92.json?alt=media" }, { "category": "description", "text": "### Summary\nInstance template files can be used to cause arbitrary read or writes as root on the host server.\n\n### Details\nIncus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance's filesystem.\n\nThis was allowed such that a template could theoretically read a file and then generate a new version of said file.\n\nUnfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges.\n\n### Credit\nThis issue was discovered and reported by the team at [7asecurity](https://7asecurity.com/)", "title": "github - https://api.github.com/advisories/GHSA-83xr-5xxr-mh92" }, { "category": "other", "text": "0.00047", "title": "EPSS" }, { "category": "other", "text": "4.5", "title": "NCSC Score" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" } ], "product_status": { "first_fixed": [ "CSAFPID-5969890" ], "known_affected": [ "CSAFPID-5919453", "CSAFPID-5944290", "CSAFPID-5944295", "CSAFPID-5965579" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33897" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33897.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-33897" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33897.json" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-83xr-5xxr-mh92.json?alt=media" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-83xr-5xxr-mh92" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/lxc/incus/security/advisories/GHSA-83xr-5xxr-mh92" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33897" }, { "category": "external", "summary": "Reference - github; osv; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33897" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://github.com/lxc/incus/commit/487edf5984fad89b0f762c03a7e211fdd38396fb" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-83xr-5xxr-mh92" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.9, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-5919453", "CSAFPID-5944290", "CSAFPID-5944295", "CSAFPID-5965579" ] } ], "title": "CVE-2026-33897" } ] }